Searches for Dijet Resonances: Using √s = 13 TeV Proton–Proton Collision Data Recorded by the ATLAS Detector at the Large Hadron Collider (Springer Theses)

This book addresses one of the most intriguing mysteries of our universe: the nature of dark matter. The results presented here mark a significant and substantial contribution to the search for new physics, in particular for new particles that couple to dark matter. The first analysis presented is a search for heavy new particles that decay into pairs of hadronic jets (dijets). This pioneering analysis explores unprecedented dijet invariant masses, reaching nearly 7 TeV, and sets constraints on several important new physics models. The two subsequent analyses focus on the difficult low dijet mass region, down to 200 GeV, and employ a novel technique to efficiently gather low-mass dijet events. The results of these analyses transcend the long-standing constraints on dark matter mediator particles set by several existing experiments. Front Matter ....Pages i-xiii Introduction (Lydia Audrey Beresford)....Pages 1-2 Theoretical Background (Lydia Audrey Beresford)....Pages 3-21 The ATLAS Experiment (Lydia Audrey Beresford)....Pages 23-38 Physics Object Reconstruction in ATLAS (Lydia Audrey Beresford)....Pages 39-68 Dijet Invariant Mass Spectra (Lydia Audrey Beresford)....Pages 69-97 Searching for Resonances (Lydia Audrey Beresford)....Pages 99-118 Limit Setting (Lydia Audrey Beresford)....Pages 119-141 Conclusion and Outlook (Lydia Audrey Beresford)....Pages 143-147 Back Matter ....Pages 149-169